ในโลกที่ถูกเรียกว่ามิติทองแดง สาวไฮสกูลกลุ่มหนึ่งต้องต่อสู้กับพลังด้านมืดที่มีอยู่ทั้งภายนอกและภายในตัวพวกเธอเอง

Tae Ukishima works at the front desk for a company. Her dream is to marry a competent man and live as a housewife. Her boyfriend is Shunpei Shiraishi and he works at the same company. They have dated for the past year. To marry him, Tae Ukishima pretends to act like a naive and shy person in front of him. Her real personality though is to speak frankly and making sharp remarks.

Tae Ukishima wants to relieve her stress and she decides to purchase Jun Setsuna as her boyfriend. To pay off his debt, Jun Setsuna becomes an obedient boyfriend to Tae Ukishima.